Let ( f ) be the function given by ( f(x) = ln x/x ) for all ( x > 0 ). The derivative of ( f ) is given by:
a) ( f'(x) = 1 + ln x/x² )
b) ( f'(x) = 1 - ln x/x² )
c) ( f'(x) = 1 - ln x/x² )
d) ( f'(x) = 1 + ln x/x² )